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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d17aadc31b4ae062c2c768eab2f00acb50b7e308d7ac5d4bdae48483255bb7' 
  AND token = 'G9u+VXfem2RhhBupHMyMxpptwUwwgrtKWFKv6+xXcqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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