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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd871f18898835d7c0cd7784eeaada02e76ae494ad51a821ba15391025a304bcf' 
  AND token = 'UXp6S/Ds1qooWS9cL27u0Kh6JxCVD5Af4cgO1Hp7FXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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