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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47b11dbc021fb1768ffe59e8c300fe5a372b30973c6fdd36b388add8925f548' 
  AND token = 'dLyDp0cchau1ac4kvQRcEu/C+vuaYH6AMX3zp89DYD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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