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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dcfc98bdd38ca5eff2071f37f84ff9e53e33eff917bfea62baaaa72066f7e33' 
  AND token = 'YiAXn0UfijuTaRhoYZ4dueQLn+i/4ebHl9dKVJE8Lmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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