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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b52f52db1dc72069301a5ee8b7f38ba634469ced5b5dec0b5bbcdd62ff050db' 
  AND token = 'z/ptU6VaimPUOVb0uao/wrU7YdyuhVGJnZddwHLEhqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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