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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462d17b6df4399d8c87f7f9ead10edfe84076495971107ace3c67cb347ea4689' 
  AND token = 'C2X6ihbe9KPwCS7dmMMsBvupEoU041TbuNM7rUD02Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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