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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e012b79cb5d608ce6d7963b9eef3261d93903b73229482378106df96d695d2' 
  AND token = 'CjVoWQ1Q1uTmVsEse6eNtgitwmTFkPU5a+Q+9hHNosA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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