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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f188fbdc3afb5d470c373952d6bf0f0f9ecb8c78952ea7fbf836f1b8ad719317' 
  AND token = 'bMztZ0bxx39eO8DwlLmfLzI/oAIsgqJPkrWEpr5z7/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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