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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac06ba243c12da103edeb6108f4b29bc321951fb3db46f1ba426af6574f77f0' 
  AND token = '8neUsBvq4NqLtcrf3WyhsZD3kCfYqo1eCdn0LnlawM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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