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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab48d68eaa21732337806f6efd2dcc90fcd0019de921d6b5e51716f4ccd7577' 
  AND token = 'sNBlUzjQJzMQJZkB0Ost0rB6k7Im760SLqEeKkJ517w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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