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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d538cb730de83a6caaa89bb6b698307ffe4ab8ff24525f0387c7765516b7e9' 
  AND token = 'jGHDPIXx+bx729X7Oeaor60B2+gyJwMEgPTQ09Yp5GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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