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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfedcf3fabfa495ea0ad99299e3baa5fd1b41cba8af932ee33344222971a8992' 
  AND token = 'bv0hpM7gJzPnODXFD7Q7C2FCxG1c0Iqkzpe5i5oHG+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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