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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da878b037741efaeac899b70a8b1e39c0182e663ef0f050da2a76df8fbd33d77' 
  AND token = 'ph7XnlAxswW8MjMLIXaRD6a3wXJmQpS9k4t+3eYKAX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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