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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3af050f82f7790c258227b164c1ed89df417326d3a79874d4dba139778998af' 
  AND token = 'ntvrw147q/Prg1VZcEZkwHrplJR3HUmV/RXeH1yV59c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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