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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae2244d8ac455430e338a58e45f78dcfd409f2ca490187d071f2fc8fee45389' 
  AND token = 'FoZBFmpilTjVJ1FTsMvGO8j7s6xZeVf1zvC9BPo9oB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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