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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0890ba3d17033270888315fa7efc127d56010bb7fb67d7064727b7ebc1d8f32' 
  AND token = '1iprDUb1Zxf0UVUAg0wD81T8woBWXhWb+V2JB1dURtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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