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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938a065569173e49bafc46d678a8091d89f324ad662cf4a4ac9ea0e5f97d3c4d' 
  AND token = 'sdheTr3r4ZXFUWZfDywP6Iq1bZFxIRRzjh/e+WMGTyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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