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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e24ef53c5b4e6226400f62961a842f0d8cdecf3ec0d9f02b45c10d27ad3fc2' 
  AND token = 'luFs84fWpFBwaEDxbDGQP6hBbPN5RREtOBucTvCINT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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