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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1463d20db0f2894eba6c75ce118a65b0af71f5489f665f1ef22278453ecf1fa9' 
  AND token = 'UCTLo5HOLTY9RA2K3FtJ67E6q5s5EF20OG12pf9osbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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