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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65052866f5e705fb42876485e19383ecdf24320b4dd88b102ac7c071f3ff731e' 
  AND token = '5IpHnSJ4/tMOZkio5ACcLzhi3BclnUC2PhMIpBzwtpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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