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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2897768e84545a1ae608ce7c9254b7307dbbbc9b0abde18c1c2713e483a7a74c' 
  AND token = 'mhqI5t8rmj8K7/Rg9R7yfqRO9dk3u7HsEaWfxBwdI/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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