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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4518ff30fcebcb1cf7f4eab4d50607e3788337326f23d7b0c1c929a938c808' 
  AND token = 'nYv270N4me3O/Kc3QcAQEaqIMVWe6JZO+3ZjRjDuCIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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