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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063c3bd8a6c131ec9e45437ec7350390db8253f3a3e07a7df4df4e7db028c027' 
  AND token = 'rZEzMuXx5h6erK9/41R2ZJX0T8kO+3AgYweRZTVJV/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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