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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '561e026391633226aff55948668a54e4a946a47f1926c9bb510584bafd2893e9' 
  AND token = '30R9adpNCzJlZ91m0D7AU5JS6XVWUNCjTgsqpVG9uxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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