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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d8f7ebb32fbb65e8e1afc06c65cd75fe6182d8d3d385f89d2e7f77fcd88fa85' 
  AND token = '1lRJOot+sJ3fLdprF4/pPFk3TGE8o+MQe2LXDjcg5Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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