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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b923126afaeb88f5eebd8fea3e0bea9668767b70aff46645d2af8a9685123e' 
  AND token = 'ic1S1pm6eNP4bj0kIADyx2gu3N/SmhWnQ/5dD4x+g9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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