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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c3a6aa7e40394c13f9d71df3f51c601137a36cbb254ef450d6cae3eaa8a100' 
  AND token = 'Ew0UZqowxgf2bMi1JW5R3cSJrrVN16SWvKJKJruZkB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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