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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a83e7da06feb8b0e4db10a7737ef7c4cb8db15b169e5a4e4b1e1dda735e88a0' 
  AND token = 'zLvi9wmXthlgAWl32lS/YJhMWZnbwo673QyDfxzBgX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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