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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b35939a1e4b099146867be6c769935cbab43ef938990a5ec56e124544174473' 
  AND token = 'JVmJD8gv0UUI1qYjiJBy7F24FpeabpGzwLb5O4yJrwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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