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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87ed3dfb0055fa6a3dc6bbb2627f6ccd237e4b6921c7377e99937881ac7e4f4' 
  AND token = 'UXpxHHMC5PL1nZ1zn71NuJgvkUb3XjueSjyf76z/dho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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