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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d5a9d6e64e98c04d2638b1757bbc0e1fa2471d30ecbe517c6d7e574ecab9d7' 
  AND token = 'nvfDpyV9mcz4mx8SsPhpM6e0xCQrCoxZ/UZY6Nyj3T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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