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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3464116bd77cf3705832cb32ad4c481ee63c34d71c40161320a3cd312d34174' 
  AND token = 'bRmtb1ZJv4g6Oeyjb2dIRSiUqKSui8McNGXSTvEz/7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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