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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0049c501334fc99a51a055cb67e4c71a7cf7ededaef92aa2a01145053b8dd0' 
  AND token = '805g/juh01tNKEZEKf0va7+Ei6zRqNZAnc16WpDiays=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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