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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddcfe19198f404340817b35240b371f769c2af18bd5bf8b7ffe1632b162b3e86' 
  AND token = 'eLMZJIc+CPP9XvHsTj9021XBTk6+tyGYkXkpogd0Blk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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