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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ceb507d27b53336849b055742e87f816641a76bad362fe44b27ae74d2ab10ce' 
  AND token = 'Qi6sx9TBWs8GZjWZ/EgPYhF97EQ31saTNVDOaD/im4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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