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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04fdb6a2049a3dafefec1e5215af18bd9890bb7e19ed1d6c5f8004a7cf3e522' 
  AND token = 'vCS8nNj1X7c5O1cAdmgJBce+y1RjEUalhaEzfEgTDyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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