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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a6fda1254b43e4e7eee1c3bc4b7248c6310e4a0ef38dd3e1ff5202ef69590f' 
  AND token = '8tLY9PmwtgAqTJbKdD39UhToC3lVK6NdG1FDsyj7I1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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