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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9288a7a92254d693c46e435fb8948d97643e944b7e565310cccdbf253fdd93' 
  AND token = 'sk80e4CiPiCiQCXpn2bjv3ZisMotsrNYFYLnaehT42U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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