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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f137f862f0c8609eeb4316b7ae284c377191ba1e978dbc72ea22e238ac512037' 
  AND token = 'E0+B+iA6rYd8Cz72uLOaVko1jfQ2Dp7D7FB6yR86iN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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