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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9297a2aada056fdf18cb8215cc21e236ac4e9de2d766735295edf4b4631413' 
  AND token = 'q/502U8Tdk/YSAVVL/lYvpRrvZ7KNxEUus3j0HBUaT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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