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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97acc4aa5ee8e63443d480e34152fe7dbab93cce166425dc165a051ce1dd3e0b' 
  AND token = 'imvcGnYP8xujqL/pUlK/mk6GfCgm/S13beHBBQ4iXeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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