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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae30a05433bed18ed019f38e500523677e01aed5c7621036893e5d0584a159a' 
  AND token = '2VJ7ubPNPwsr7Az83BOmmmEEq0bS6pqNPKwp7Sq7+v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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