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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46b2ae0771b6bf6f42bc40366ff412f06b9186e437c50f35b6b4cc2caebbb23' 
  AND token = 'fLEp5G8qtT/tsi0VRA8YTOPWN7M4R0960DrIM28L8/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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