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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2897fe56a1029fd0374e0430615f30b4edd095b73772e47ab4b99f9bcdb76cb0' 
  AND token = 'zmy7tlYC7rk5/nrxjgHBEsTPSw0Li08xqQPOYuiszc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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