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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44e3da3c5c9b3d59f047cafc2f3bcab1a5f130c6e64c2ebb188a07bdc844640' 
  AND token = 'nPI6Rvzg8/njmfM93Vogy8FJuvX/ToH4bXVajy44GIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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