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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4801ae6aff62f62839a89dc7334d562330723827bb0770648328c8d0ad49c63' 
  AND token = '9ygiSy5BuIHVvoY7PHvh3E2JdaW2vMREVLXgvDxPhzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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