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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11eb8ce1d59e3c6788dcc9bc7461d456fde04fa69a6fc5458756eca68c0fbfc' 
  AND token = 'CzMRfgg315J0EVEdFqax2RIRsSsps6YIQug4nWFtEwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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