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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06a95b03e15d84cc397cab0ee788fd7cfdcf6482dc57462dc6db071d3f1854f' 
  AND token = 'BCWu4cFC9d0OUfebGUvMtAgTNrc7toe4a4WHii2qbPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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