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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26dc41883d8e8c1b97f866db6f6b267544b951cfbc57defd761c6e71bea81dd1' 
  AND token = '+2aRjNWec8++Zr8xyuIt+YlLX8r0ctWVrqq0/v8xPr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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