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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d09b84c9962b92583f54781aa67c55478cb03238b6f15f62cfc3aa4ee4a4da7' 
  AND token = '8WUaZUx/zU4CQUyWgvz9sz25RTlNIcnHej/nxIpd8vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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