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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633ed8188d7670db82c024a13bdb123b2d7d0961e8bfd20821f51729148a3893' 
  AND token = 'nLYCZHvev5BXs9Zl0rouFjNRi+p3O93aQuu7qD318bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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