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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dab9b0b67d06c9600c1b8ccd8e1263ee38aec3a95f7aff4c51db52f7931084d' 
  AND token = 'x7jfIPmWNxkeaDITL1FIM2PQrXg5EkF5pQQ64YU7/9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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