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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc4e5f27663f1c9e7bf0465ef6226b182b755dade4cfca9f41f2bcdbfc9f36c' 
  AND token = '8f+eJvie1unP0tN1k2EbVD7EV/sl9kNk5Ykp7o++NqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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