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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1528c83d7a9c0a6c35811b94fd2f882cca7adcb54a477741e66e6dc80a3ad2e6' 
  AND token = 'uaAkUeFjAJnvABYxtyEtrFfzwxH789kfuwmv7mUkVoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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