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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc34a2a90dfecac3cb0ae5696ac65af74d1cf9d8e5f32be91efda7d7d55078c' 
  AND token = 'HBGVFDWy80X66erFnEo2p7K+vS98r6AgiKVAAEAO5cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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