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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73276d6439507a10e7d79e7177180fa989e1c286683760c3b3d5c89cec8b770' 
  AND token = 'wQTnK+1G4nN066Mt+QFz0HncwE+t2tfj62vFmlmymUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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