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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fae92aaa92fa6b2acf4249be40539b5817aab4d711d7d1a28ec2fe95cc2ed67' 
  AND token = '5ruEkqOBqh9hxIOwZUSLt0fA+0KrV3pzYBfgAbfUWIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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