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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd70bee8599b84b18c4011c3b138de4c60efef4ffb40343fb5bed838ad38a47' 
  AND token = 'SwvyFgUBx5lbFvifu7eBIkMW1KTf6KZ43v2QWs2BcYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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