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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '125fb54236b3bc1a305744f6a2685f78fb2095a05d7ef1ae975d0f77a0eb5e7b' 
  AND token = 'FF7y4INbndrX78bu22wuCVj1CMDzc/ab1Fc/ZD24RUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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