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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd9c00a6168629056d4a5c7aa9a5630d567eaab224a3fc53a306d169bd653dd' 
  AND token = 'rSt8ESO7lMxJOJfwuY4c29dcBKkT+NudXSWCAoF+9VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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