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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9120c282dea5661d320ac50304d9a2023fe2dfd4e66d73e0a6b0ed8ce053908' 
  AND token = 'tcqt+CdvKFsS9rFDQML0MhtXeJE3yj0dr+nqm4lAq2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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