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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fecde309f37fef9a2ee82405a2f455c9f72f6be726e815c95cb168b58a800e6' 
  AND token = '0Tlt77vufn7vG85k9uBJQj/bCT509KIfrzS9l/yKBgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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