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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d3ad952daff12368b21f4434bf5ddf96408040a163fefaac5eee8e75daa621' 
  AND token = 'wh3wkyjXE6rd50Scm07MxlNqH5Ee5SNxt1pOS3UJ7Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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