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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a75e34b541ab95698512bfecbf73967e3715acd5af83fa8cef2167eac1b6803' 
  AND token = 'u9B/HededTh+eoDOgFO9o2yzMWXe7TTHrNI8NANq0ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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