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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7fbaa3de2129c8f634a9ec3e3a3ed3ebe46368b079e19d4c5bfb979ce9c184' 
  AND token = 'viHOm+ZPIp1b+e8WgalxT2lG2c5DU0KnKLKDVna90pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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