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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db2f56c691c224086f05a75c884f5bc6d36304128c971e615d8931cb25da693' 
  AND token = '2T0O/Puna2s8bZib+iV56axNCfbbh0w1ibc+as7uWD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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