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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbdb381a0cd9dd2fe79d2c12801179a4fa59ea2c4acc9a346a4db0a614806f80' 
  AND token = 'a+idWo5G1dZTd9rpm/17MR+dpttkoU3Nm/ygQbHQEKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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