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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3b1d7ff4366d796ec6f88f3717e7e200012b4b1986ff40f579cc15a8dc4087' 
  AND token = 'vrPpF8K4KFbE/6iBAlr+xywxsi8XlfnWO7afapamVDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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