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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6294725acbecf8dbf23b06a939ba73dabeb47052064f1ef5976785f37ab5a4cd' 
  AND token = 'Jf1P7EdNm/0rysuhW9aVMdVuA5/FFpsSK2P94G/Ic4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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