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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac63ce22c5a7bdfae693c251afb86edde7e86c02240ce9723e1ffe2d6ce0be15' 
  AND token = 'etStJDxd+iOyXYhHSjsv6xT1PbWIl60IzipmW9eZa3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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