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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68533473deda63a560dd9e5012ca3578dfdf1c4878f8359be0fd9d3c35a83c4e' 
  AND token = '5YZsnr37tYwDdDl9X03SF3le/KSA+RovW0AESe4tJxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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