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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ed28815e9e9615edc781f77e0ce2e21ba61aef47b758da2a286b8f632ef33d' 
  AND token = 'lZFj6md5kknvgCWgZkWYKDvogRg1MAQEagz0jzc0SRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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