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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9b5f9e356836f9273cdbcc24ccfa575571876443c6440257006e3b2c88e807' 
  AND token = 'UNX7x7fSFeUwQ4gpHXDwHq9eJzlgIYKFFNSHA67T1sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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