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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2ceb0ad9f4bf49c3ecd399306d1697442d8744071daa99481484587ee4422d' 
  AND token = 'Ge5jsLzn4o4gc0hQhZSUpfGf68WTpgHujieFRa2NzJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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