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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5a2a2c222ef2e9ada517d14688e507daf54d87a41615d6a8a594dd309d11ba' 
  AND token = 'wcq8wjuFFmUtRsKEakAwPwrvM9P8rIHEB3iyB46Kaso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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