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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f29e2bf208f0194177e1511748afcb24ae704c1b0798cfc569301ac3745910' 
  AND token = 'aP9N9TWcRJa+y80bNwBxuJBnUpI24p2DPC2EB0bDAso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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