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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f1faf36a8dfc902d0bd02953360335340bcaa0efd2f25fe9b8f51690ba22fc' 
  AND token = '3dpfKO7QYRL/S9aRlPWF88ZoXEwk4nuKyxeQrotT7Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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