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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83b43ed8bb33a89b171030793a63e769107e965c941c8f0aa94a4fe6e4814ce' 
  AND token = 'F4r5TEps/GsliIfRcnDQ2XusQJ8U/Vi+Y7U0qTs0+4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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