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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886d55a4e70c054c15b1f6ff1645cd1c9e33f2288ffa09e3cd7c1b136124eca5' 
  AND token = 'LDxmGXJrmiiU591iiksJ0rkw/wsj5BElbe89VQADh80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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