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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a06e74e96f2937378f539a3ad03d8c2422b6ff49e6cd885a4fb917cebcdb8f' 
  AND token = 'ec7gteR7KD3VrYT7/ki+fb0beY6iExUOAINY8EpRnJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}