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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee81cf5b9bd348963fc0ca9f790d055008271a8c6d7e9ef1166d71ecb1ed8bc5' 
  AND token = '9ijtsMI4JKKGRexTbd8iuITCKiIau8JLUh6lG0lRI+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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