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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c538e89094759e0758142e93b424be9fa2888d9a6196e8d1f4cf0d3ff644019' 
  AND token = 'D5JDJ2pTK8gsXTGOJBTCxGcqpuapMW0WcbBgsb0Qs0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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