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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c283b0afda69ee6b85143689c8ac9b6afa9c2059cbcef16a4a51375d93ecde8' 
  AND token = 'hGULwZFinezb92M0pkmTW0XtUPA+/Qg1O+2Q5f071mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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