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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e5ac4ee919e63d6527e4c8ee345392b426f4f1fd7a259a05c675be8aa23e7f' 
  AND token = 'ntFLh4LGm9QUUzCoocsAVP9jAtZo7JPoGlwqCH85C6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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