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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d914a49be310851a06aae03eba4fa24c6c8dd30964fe0f10530a6d9c27b47a0' 
  AND token = 'emaUAf5YeurNTL58uYWP3MJ/IGl8KSs9tFth+gmM3vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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