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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940dae5438fa66b5bedd0ee0b936d78f5ecc6d5aa6242c04424b7b9222f2f97c' 
  AND token = 'qiNDobBErK/37AwfTl7VBBKEv3NMWIN/oDQjAg2zSfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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