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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd451e9e624298fcd9ed22c8a3c4d0cde38df5a58eb47a191be7913cff06a24' 
  AND token = 'WPsYMcz/s7S4P8OScWA3ht7f+5m4nIeCUMI9q0j4Kyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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