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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6304efa617b3c76d98885fd32509381a4e817d03301517ea8cae57f0892888db' 
  AND token = 'gglZSuFqcqS0C2cJtyfVuRte7s1CVg1hydki0V9z0W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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