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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c4f66ebef9c3fd584652aa07d5747ffafa15946fa4a0e9b739ad71981d12ea9' 
  AND token = 'xhZrtPDb0oREob4ofspeigDJjqLHE+tk/+02YZDL5Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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