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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e76dfa5d8fb6d7fa4e8997bc5aae0c84be9aea6ad4624d2680ce2407aa5266' 
  AND token = 'Y5ny50rhhjOadqbMHABmpfK4RyJutGQzFCfRfMOYNyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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