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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d44ff5636bd7577b2c0a00fc2dca28d7834d844130c9e68b9463d4d58dfda8' 
  AND token = 'vbnRb7910TuVkmefQ3ZQ0WRlGmY7l23yqwag1nUnco4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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