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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88a64c402b40844ccb950d4a8ace099e2fc13b9004132ba8f61a6feca3b9a32' 
  AND token = 'nstROhhvNxeAsCIzLduDsK/3Egzeq6QGQsKIUEToYDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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