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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4793c1e90109c35933185e5231aa23e00850993714fd5dcdf8ecdda973733548' 
  AND token = 'eyHh7e/OqDluZeY23thfGIor+XGHu0QJCUNnDJaWiuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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