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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf1b4a68b917682abe57722f53a46ba0e28469d94eba54a1176b8f2b2eb05bd' 
  AND token = 'uTP85I7OkC27mLmNtUcV5B26skxc6SdIXn1Zna+EYDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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