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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2cad3392b074d195f6bd7da6c1bfed93e563fd452d8ec707409532db6d25f59' 
  AND token = '2mFm6m5HlNmQPkGggzC5tL4TR1dMT1ZRbTb+2f8q/QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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